java中压缩文件并下载的实例详解

//定义压缩包存在服务器的路径
String path = request.getSession().getServletContext().getRealPath("/WEB-INF/fileTemp");
//创建路径
File FilePath = new File(path + "/file");
if (!FilePath.exists()) {
FilePath.mkdir();
}
String path = FilePath.getPath() + "/";
//定义导出压缩包的名称
String title ="问价压缩包";
//压缩包格式
String fileNamezip = title + ".zip";
String zipPath = path + fileNamezip;
//创建一个ZIP输出流并实例化缓冲区域
ZipOutputStream out = new ZipOutputStream(new BufferedOutputStream(new FileOutputStream(zipPath)));
//设置编码格式(解决linux出现乱码)
out.setEncoding("gbk");
//定义字节数组
byte data[] = new byte[2048];
//获取文件记录(获取文件记录代码省略)
List FileList =。。。;
if (!FileList.isEmpty()) {
ExportUtil util = new ExportUtil(title,title,
request, response, FilePath.getPath());
}

util.startZip(FilePath.getPath());

for (int i = 0; i < FileList.size(); i++) {
fileVo fileVo=FileList.get(i);
export(fileVo,request,response,title,FilePath.getPath(),fileName);
}
------
public void export(fileVo fileVo, HttpServletRequest request,
HttpServletResponse response, String title,String path, String fileName) {
FileOutputStream fileOutputStream = null;
try {
File dirFile = null; 
int i = fileVo.getName().lastIndexOf(".");
    if(i!=-1){//存在文件类型
     fileName1 = fileName1 + "." + (fileVo.getName()).substring(i+1);
    }
boolean bFile = false;
String mkdirName = path + File.separatorChar + title;
dirFile = new File(mkdirName);
if(!dirFile.exists()) {
dirFile.getParentFile().mkdirs();
}
if (dirFile.isDirectory()) {
path = mkdirName + File.separatorChar + fileName1;
} else {
bFile = dirFile.mkdirs();
}
if (bFile) {
path = mkdirName + File.separatorChar + fileName1;
} 
fileOutputStream = new FileOutputStream(path.replace("*", "")); 
String fileName = URLEncoder.encode(fileName1, "UTF-8");
if (fileName.length() > 110) {
fileName = new String(fileName1.getBytes("gb2312"), "ISO8859-1");
}
response.setHeader("Connection", "close");
response.setHeader("Content-Type", "application/octet-stream");
response.setContentType("application/x-msdownload");
response.setHeader("Content-Disposition", "attachment; filename=\""
+ Utf8Util.toUtf8String(fileName) + "\"");
//读取文件流输出到到另一个位置
fileVo.getFileIo(fileOutputStream);
fileOutputStream.close(); 
} catch (Exception e) {
logger.error("异常：原因如下"+e.getMessage(), e);
} finally {
try {
if (fileOutputStream != null) {
fileOutputStream.close();
}
} catch (IOException e1) {
// TODO Auto-generated catch block
logger.error("异常：原因如下"+e1.getMessage(), e1);
}
}
}

util.entdZip(FilePath.getPath());

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import org.apache.tools.zip.ZipEntry;
import org.apache.tools.zip.ZipOutputStream;
/** 
 * @project: Test 
 * @author chenssy
 * @date 2013-7-28 
 * @Description: 文件压缩工具类
 *                   将指定文件/文件夹压缩成zip、rar压缩文件
 */
public class CompressedFileUtil {
    /**
     * 默认构造函数
     */
    public CompressedFileUtil(){

    }
    /**
     * @desc 将源文件/文件夹生成指定格式的压缩文件,格式zip
     * @param resourePath 源文件/文件夹
     * @param targetPath  目的压缩文件保存路径
     * @return void
     * @throws Exception 
     */
    public void compressedFile(String resourcesPath,String targetPath) throws Exception{
        File resourcesFile = new File(resourcesPath);     //源文件
        File targetFile = new File(targetPath);           //目的
        //如果目的路径不存在，则新建
        if(!targetFile.exists()){     
            targetFile.mkdirs();  
        }

        String targetName = resourcesFile.getName()+".zip";   //目的压缩文件名
        FileOutputStream outputStream = new FileOutputStream(targetPath+"\\"+targetName);
        ZipOutputStream out = new ZipOutputStream(new BufferedOutputStream(outputStream));

        createCompressedFile(out, resourcesFile, "");

        out.close();  
    }

    /**
     * @desc 生成压缩文件。
     *                  如果是文件夹，则使用递归，进行文件遍历、压缩
     *       如果是文件，直接压缩
     * @param out  输出流
     * @param file  目标文件
     * @return void
     * @throws Exception 
     */
    public void createCompressedFile(ZipOutputStream out,File file,String dir) throws Exception{
        //如果当前的是文件夹，则进行进一步处理
        if(file.isDirectory()){
            //得到文件列表信息
            File[] files = file.listFiles();
            //将文件夹添加到下一级打包目录
            out.putNextEntry(new ZipEntry(dir+"/"));

            dir = dir.length() == 0 ? "" : dir +"/";

            //循环将文件夹中的文件打包
            for(int i = 0 ; i < files.length ; i++){
                createCompressedFile(out, files[i], dir + files[i].getName());         //递归处理
            }
        }
        else{   //当前的是文件，打包处理
            //文件输入流
            FileInputStream fis = new FileInputStream(file);

            out.putNextEntry(new ZipEntry(dir));
            //进行写操作
            int j =  0;
            byte[] buffer = new byte[1024];
            while((j = fis.read(buffer)) > 0){
                out.write(buffer,0,j);
            }
            //关闭输入流
            fis.close();
        }
    }

    public static void main(String[] args){
        CompressedFileUtil compressedFileUtil = new CompressedFileUtil();

        try {
            compressedFileUtil.compressedFile("G:\\zip", "F:\\zip");
            System.out.println("压缩文件已经生成...");
        } catch (Exception e) {
            System.out.println("压缩文件生成失败...");
            e.printStackTrace();
        }
    }
}